Envelop.



trice. l

CHARLES W. ALLEN, OF PHILADELPHIA, PENNSYLVANIA.

ENVELOP.

SPECIFICATION forming part of Letters Patent No. 662,382, dated November 27, 1900.

Application iled January 9, 1900. Serial No. 805. (No model.)

- To @ZZ whom it may concern:

Be it known that I, CHARLES W. ALLEN, a citizen of 'Great Britain, and a resident of Philadelphia, Pennsylvania, have invented certain new and useful Improvements in En# velops, of which the following is a specification. V

This invention relates to an envelop provided with a front and a rear flap, which are adapted to interlock and to thus effectively protect the contents of the envelop against pilfering. By myinvention also second and third class mail-matter in granular or other form are con fined in such a manner that they cannot possibly escape at the folds of these closing-flaps.

In the accompanying drawings, Figure l is a plan of the blank for forming my improved envelop. Figs. 2 to 5 illustrate consecutive stages in the folding of the aps of said envelop. Fig. 6 is a cross-section on line 6 6, Fig. 4.

The letter a, represents the front of an envelop of the usual or suitable construction, and o is its back. From the edge of the front a there projects a front flap c, creased at c' to fold forwardly or down upon the front, while from the back b there projects a rear flap Cl, likewise creased at d to fold forwardly. One of the flaps c el should be of greater width than the other and so constructed as to be adapted to be interlocked therewith by folding around the edge of the same. The flap d is shown to be provided at each side with a laterally-projecting wing d2, creased on the diagonal line d3 to fold forwardly over the edges of iap c. The flap d proper is of substantially the same size as the flap c, and the wings d2 project, preferably, a distance above After the envelop is charged the iap CZ is placed against flap c, Fig. 2, one wing Z2 is folded over flap c, Fig. 3, the second wing is folded against the first wing, Fig. 4, and the flaps thus interlocked are folded down upon the front a, Fig. and attached thereto by a metallic fastener passed through perfora tions e or otherwise. Thus it will be seen that the envelop is securely7 closed along the entire folds on creases CZ c of the closing fiaps and access to or escape from the en velop is prevented.

What I claim is-' l. An envelop provided with a perforated front, and flaps projecting from its front and back, the rear flap being wider than the front iap to form laterally-projecting perforated wings that are adapted to fold around the edges of the front flap, substantially as specified.

2. An envelop provided with liaps projecting from its front and back, the rear flap being wider than the front flap to form laterally-projecting wings that are adapted to fold around the edges of the front flap, all being so constructed that the flaps thus interfolded are adapted to be jointly folded against the body of the envelop, substantially as specified.

3. An envelop provided with flaps projecting from its front and back, the rear liap be ing wider than the front flap to form laterally-projecting perforated wings that are adapted to fold around the edges of the front flap, all being so constructed that the flaps thus interfolded are adapted to be jointly folded against the body of the envelop, substantially as specified.

Signed by me at Philadelphia, Pennsylvania, this 30th day of December, 1899.

CHARLES w. ALLEN.

VV'itnesses:

W. KAY, M. KAY. 

